-
公开(公告)号：JP2000143846A
公开(公告)日：2000-05-26
申请号：JP24722499
申请日：1999-09-01
Applicant: TORAY INDUSTRIES
Inventor： NAKAJIMA SHOJI , TSUNEKAWA TETSUYA , KOTOURA MASAAKI
Abstract: PROBLEM TO BE SOLVED: To provide a high-quality polyester film which has a high running ability at the surface, wear resistance and productivity, simplifies the process and lowers the cost, and a preparation process of such film. SOLUTION: In a preparation process of a polyester film, at least one side of the film is irradiated with ultraviolet light to form fine projections on the surface. A polyester film has a ratio Rz/Ra of the center line average roughness Ra and the ten point average roughness Rz of the surface of at least one side of the film of smaller than 20, and the concentration of carboxyl groups at the surface part which forms the surface is larger than the concentration of carboxyl groups at the central layer of the film.
-
公开(公告)号：JPH11322972A
公开(公告)日：1999-11-26
申请号：JP14039298
申请日：1998-05-08
Applicant: TORAY INDUSTRIES
Inventor： YAMAGATA TETSUYA , KOTOURA MASAAKI , TSUNEKAWA TETSUYA
Abstract: PROBLEM TO BE SOLVED: To decrease fish eyes and die streaks occurring during long-time continuous film production to reduce film breaking and thereby to stably produce a high-quality film by compounding a mixture of a non-liq.-crystalline polyester and a copolyester with an acetic acid generation inhibitor. SOLUTION: This compsn. is produced by compounding 100 pts.wt. polyester comprising 99.9-60 wt.% non-liq.-crystalline polyester (A) and 0.1-40 wt.% copolyester (B) having mesogenic groups in the main chain with (C) 0.001-0.5 pts.wt. acetic acid generation inhibitor. Pref., ingredient C mainly comprises amorphous silica and has an average micropore size of 100-250 Å and an average particle size of 0.05-5 μm. The amt. of acetic acid generated of this polyester film is pref. 250 ppm or lower in terms of film quality. Pref., ingredient B is a copolyester comprising four kinds of structural units of formulas I, II, III, and IV (e.g., R1 is a group of formula V; and R2 is a group of formula VI).
-
公开(公告)号：JPH1044229A
公开(公告)日：1998-02-17
申请号：JP12871397
申请日：1997-05-19
Applicant: TORAY INDUSTRIES
Inventor： KOTOURA MASAAKI , TSUNEKAWA TETSUYA , TSUNASHIMA KENJI
Abstract: PROBLEM TO BE SOLVED: To improve uniformity of thickness and to make processability good by a method wherein a substantially unoriented polyester film consisting of liq. crystal polyester and non-liq. crystal polyester is set in such a way that temp. coefficient of drawing stress satisfies a specified condition and it is at least uniaxially drawn. SOLUTION: A substantially unoriented polyester film consisting of liq. crystal polyester and non-liq. crystal polyester is set in such a way that temp. coefficient K of drawing stress satisfies an equation -0.35
-
公开(公告)号：JPH09314631A
公开(公告)日：1997-12-09
申请号：JP7199097
申请日：1997-03-25
Applicant: TORAY INDUSTRIES
Inventor： KOTOURA MASAAKI , FURUKAWA KEIICHI , TSUNASHIMA KENJI
Abstract: PROBLEM TO BE SOLVED: To remarkably reduce the melt viscosity of a film at its extrusion and remarkably lower its heat generated by shearing and its extrusion torque irrespective of the level of its intrinsic viscosity by a method wherein the film is produced by dispersing a copolyester, in the main chain of which mesogenic groups are included, in a non-liquid crystalline polyester. SOLUTION: Polyester stock prepared by dispersing a copolyester, in the main chain of which mesogenic groups are included, in a non-liquid crystalline polyester is charged in a melt extruder for film-making. The dispersing method of the copolyester is performed by mixing chips and then melt-extruding the mixture under nitrogen sealing with a vent type twin-screw knead extruder. The copolyester, in the main chain of which mesogenic groups (the structural unit of liquid crystallizability) are included, is a melt-moldable polymer and either liquid crystalline polyester or non-liquid crystalline polyester will do. Concretely, a polyester, which is composed of the structural unit selected from the group consisting of an aromatic oxycarbonyl unit, aromatic oxy unit, aromatic dicarbonyl unit and the like, or the like is exampled.
-
公开(公告)号：JPH08124144A
公开(公告)日：1996-05-17
申请号：JP25998494
申请日：1994-10-25
Applicant: TORAY INDUSTRIES
Inventor： KOTOURA MASAAKI , OKAZAKI IWAO , ABE KOICHI
IPC: C08J5/18 , B29C55/12 , B29L9/00 , B32B27/36 , B32B33/00 , C08G63/181 , C08G63/189 , G11B5/73 , G11B5/704
Abstract: PURPOSE: To attain high output due to void reduction as well as to ensure superior output characteristics and to reduce the thickness of a tape by regulating the strength of a film in the transverse direction and the number of voids in the film. CONSTITUTION: This polyester film is a film of polyethylene-2,6-naphthalene- dicarboxylate. The number of voids of 0.23 to , that of voids of 1 to and that of voids of >=3μm diameter is (60 per 1mm . The number average void diameter is 0.5-1.5μm and the Young's modulus of the film in the transverse direction is >=700kg/mm . Output characteristics deteriorate when the number of voids and the number average void diameter are not within the above- mentioned ranges.
-
Patent Agency Ranking
公开(公告)号：JP2001252964A
公开(公告)日：2001-09-18
申请号：JP2000066153
申请日：2000-03-10
Applicant: TORAY INDUSTRIES
Inventor： KOTOURA MASAAKI , MIYATA SATOSHI , TOYODA KATSUYA
IPC: B29C47/88
Abstract: PROBLEM TO BE SOLVED: To provide a method for producing a thermoplastic resin sheet which, in a static electricity applying cast method using tape electrodes, can remarkably increase the upper limit of a sheet molding speed which prevents the generation of the defect of electricity application nonuniformity in the sheet and an apparatus for the method. SOLUTION: In the method for producing the sheet, when a molten thermoplastic resin is extruded from a nozzle into a sheet, and the sheet is made to adhere to a cooling drum by the static electricity applying cast method, cooled, and solidified for molding, an electrostatic charge is applied to the sheet by using the tape electrodes, and ionized air is sprayed to both end parts of the sheet. The apparatus for the method is provided.
-
公开(公告)号：JP2000302895A
公开(公告)日：2000-10-31
申请号：JP11603099
申请日：1999-04-23
Applicant: TORAY INDUSTRIES
Inventor： YAMAGATA TETSUYA , KOTOURA MASAAKI , TSUNEKAWA TETSUYA
Abstract: PROBLEM TO BE SOLVED: To provide biaxially oriented polyester films improved in transparency, surface smoothness, rigidity and dimension stability by ultra-finely dispersing a copolyester into a non-liquid crystalline polyester, difficult in breaking tapes and causing stress elongation deformation when used as the base films for magnetic recording tapes, excellent in running durability and shelf stability, and suitable as the base films for high density magnetic recording tapes. SOLUTION: Polyester films (C) are composed of (A) a non-liquid crystalline polyester and (B) a copolyester having a mesogen group in the main chain, and the half width in the circumferential direction of the diffraction peak of the crystal face in the direction of the polyester main chain which can be obtained by rotating the polyester film on its normal as the axis in the crystal orientation analysis by the wide angle X-ray diffractometry is 55 deg.-85 deg..
-
公开(公告)号：JP2000143948A
公开(公告)日：2000-05-26
申请号：JP32796798
申请日：1998-11-18
Applicant: TORAY INDUSTRIES
Inventor： YAMAGATA TETSUYA , TSUNEKAWA TETSUYA , KOTOURA MASAAKI
Abstract: PROBLEM TO BE SOLVED: To obtain a high-quality polyester film with excellent transparency, surface smoothness, rigidity and dimensional stability, to provide a method for producing the above film, to obtain a polyester composition for giving the above film, and to provide a method for producing the composition. SOLUTION: This polyester composition C comprises a non-liquid crystalline polyester A and a copolyester B having mesogenic groups in the main chain, and has a value of ΔTcc defined below of
-
公开(公告)号：JPH11106623A
公开(公告)日：1999-04-20
申请号：JP27144697
申请日：1997-10-03
Applicant: TORAY INDUSTRIES
Inventor： FURUKAWA KEIICHI , KOTOURA MASAAKI , TSUNEKAWA TETSUYA
Abstract: PROBLEM TO BE SOLVED: To obtain the subject composition capable of homogeneous mixing without classification or sticking and maintaining an effect such as suppressing shearing heat generation in mixing by including a non-liquid crystalline polyester and a specified copolyester. SOLUTION: This composition is obtained by incorporating (A) a non-liquid crystalline polyester (e.g. polyethylene terephthalate) with (B) 1-30 wt.% copolyester (a melt moldable polyester having mesogenic group in the principal chain) which is dispersed to 5-1000 μm disperse diameter and consists of structural units such as OR1 CO (R1 is a group of formula I or the like), OR2 O (R2 is a group of formula II or the like), OCH2 CH2 O or COR3 CO (R3 is group of formula III or the like). The composition mentioned above is preferably used in such a state that the component B is previously suspended in the component A and, in paticular, is preferably produced as master chips including the component B at high concentration.
-
公开(公告)号：JPH10204266A
公开(公告)日：1998-08-04
申请号：JP1378497
申请日：1997-01-28
Applicant: TORAY INDUSTRIES
Inventor： KOTOURA MASAAKI , TSUNASHIMA KENJI , TSUNEKAWA TETSUYA
IPC: G03C1/795 , B29C55/12 , B29K67/00 , B29L7/00 , C08G63/183 , C08G63/189 , C08J5/18 , C08L67/02
Abstract: PROBLEM TO BE SOLVED: To obtain the subject film excellent in curl recovery, mechanical strength and dimensional stability by adding a copolyester having a mesogenic group in a main chain to a non-liquid crystalline polyester. SOLUTION: This polyester film comprises (A) a non-liquid crystalline polyester (preferably ethylene-2,6-naphthalene dicarboxylate as a main unit) and (B) a copolyester having a mesogenic group on a main chain and has >=15% curl recovering property. A copolyemerization amount of mesogenic group in the component B is preferably 5-75mol%. The component B is dispersed in a film and it is preferable that average disperse diameter of the component B is
-
-
-
-
-
-
-
-
-
Search Results
58
records
(took 0.023 seconds)
